1.14.99.53	[(1->4)-N-acetyl-beta-D-glucosaminyl](m+n) + reduced acceptor + O2 = [(1->4)-N-acetyl-beta-D-glucosaminyl](m-1)-(1->4)-2-(acetylamino)-2-deoxy-D-glucono-1,5-lactone + [(1->4)-N-acetyl-beta-D-glucosaminyl]n + acceptor + H2O